MCQ : Sound - 1


10 Questions MCQ Test Science Class 9 | MCQ : Sound - 1


Description
This mock test of MCQ : Sound - 1 for Class 9 helps you for every Class 9 entrance exam. This contains 10 Multiple Choice Questions for Class 9 MCQ : Sound - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this MCQ : Sound - 1 quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this MCQ : Sound - 1 exercise for a better result in the exam. You can find other MCQ : Sound - 1 extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.
QUESTION: 1

Wave motion transfers

Solution:

Wave motion transfers energy from one point to another, often with no permanent displacement of the particles of the medium —that is, with little or no associated mass transport. They consist, instead, of oscillations or vibrations around almost fixed locations.

QUESTION: 2

In which of the following media will sound travel the faster?

Solution:

Sound is nothing more than a local disturbance whose propagation is facilitated by the collisions between particles; This disturbance propagates in a longitudinal wave; imagine one molecule hitting the another molecule, and then that molecule hitting the next molecules, and so forth.
The distance between molecules in solids are very small, i.e., solids are more dense - as compared to liquids and gases. Because they are so close, they can collide very quickly .i.e, it takes less time for a molecule of a solid to ‘bump’ into its neighbour. Solids are packed together tighter than liquids and gases, hence sound travels fast in solids. 

QUESTION: 3

The wave having an amplitude of 5 cm and frequency f = 100 Hz can be best represented by

Solution:
QUESTION: 4

The upper frequency limit of the audible range of human hearing is about

Solution:
QUESTION: 5

Absorbent materials are to be used while making interior design in an auditorium as

Solution:

Absorptive material on the back and side walls will help reduce the reverberation time and unwanted reflections. If possible, try to avoid parallel surfaces, which can cause flutter echoes.

QUESTION: 6

Infrasonic waves have frequencie

Solution:
QUESTION: 7

Speed of sound in air and water are given as va and vw respectively. Then

Solution:

In water, the particles are much closer together, and they can quickly transmit vibration energy from one particle to the next. This means that the sound wave travels over four times faster than it would in air, but it takesa lot of energy to start the vibration.

QUESTION: 8

Sound cannot travel throug

Solution:
QUESTION: 9

The separation between T and C in the figure given is

Solution:
QUESTION: 10

When we change feeble sound into loud sound we increase its

Solution:

Changing feeble sound to loud sound amounts to increasing the amplitude of vibration as intensity of sound is directly proportional to the square of the amplitude of the sound wave.

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